Hi Ulf,
> Okay, let me elaborate a bit more on what I really meant.
>
> In tmio_mmc_of_parse(), the mmc->ops gets assigned to the
> &tmio_mmc_ops. Before doing that, you can conditionally assign
> ->start_signal_voltage_switch() callback within the &tmio_mmc_ops,
> right!?
So, lets talk with code. Do you mean something like this on top of my
series? (Compile tested only to see if I got you right):
diff --git a/drivers/mmc/host/sh_mobile_sdhi.c
b/drivers/mmc/host/sh_mobile_sdhi.c
index 5d2a852f17eebd..89e0c5e9fcc668 100644
--- a/drivers/mmc/host/sh_mobile_sdhi.c
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -210,9 +210,10 @@ static void sh_mobile_sdhi_clk_disable(struct
tmio_mmc_host *host)
clk_disable_unprepare(priv->clk);
}
-static int sh_mobile_sdhi_start_signal_voltage_switch(struct tmio_mmc_host
*host,
+static int sh_mobile_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
struct mmc_ios *ios)
{
+ struct tmio_mmc_host *host = mmc_priv(mmc);
struct sh_mobile_sdhi *priv = host_to_priv(host);
struct pinctrl_state *pin_state;
int ret;
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 759bf015d09b84..b1819c74965b47 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -101,7 +101,7 @@ struct tmio_mmc_host {
void (*clk_disable)(struct tmio_mmc_host *host);
int (*multi_io_quirk)(struct mmc_card *card,
unsigned int direction, int blk_size);
- int (*start_signal_voltage_switch)(struct tmio_mmc_host *host,
+ int (*start_signal_voltage_switch)(struct mmc_host *mmc,
struct mmc_ios *ios);
};
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index 8dee637638c31e..8e2fef7c5e481c 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -1014,16 +1014,6 @@ static int tmio_multi_io_quirk(struct mmc_card *card,
return blk_size;
}
-static int tmio_mmc_start_signal_voltage_switch(struct mmc_host *mmc, struct
mmc_ios *ios)
-{
- struct tmio_mmc_host *host = mmc_priv(mmc);
-
- if (!host->start_signal_voltage_switch)
- return 0;
-
- return host->start_signal_voltage_switch(host, ios);
-}
-
static int tmio_mmc_card_busy(struct mmc_host *mmc)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
@@ -1031,14 +1021,12 @@ static int tmio_mmc_card_busy(struct mmc_host *mmc)
return !(sd_ctrl_read32(host, CTL_STATUS2) & TMIO_STATUS2_DAT0);
}
-static const struct mmc_host_ops tmio_mmc_ops = {
+static struct mmc_host_ops tmio_mmc_ops = {
.request = tmio_mmc_request,
.set_ios = tmio_mmc_set_ios,
.get_ro = tmio_mmc_get_ro,
.get_cd = mmc_gpio_get_cd,
.enable_sdio_irq = tmio_mmc_enable_sdio_irq,
- .start_signal_voltage_switch
- = tmio_mmc_start_signal_voltage_switch,
.card_busy = tmio_mmc_card_busy,
.multi_io_quirk = tmio_multi_io_quirk,
};
@@ -1138,7 +1126,9 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host,
goto host_free;
}
+ tmio_mmc_ops.start_signal_voltage_switch =
_host->start_signal_voltage_switch;
mmc->ops = &tmio_mmc_ops;
+
mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
mmc->caps2 |= pdata->capabilities2;
mmc->max_segs = 32;
> Why am I suggesting this? I want to avoid us evolving the code in the
> wrong direction, similar what has happened to SDHCI. *One* way to
> address this, is to minimize unnecessary variant specific callbacks.
Well, I can't test the original tmio_mmc implementation, only the sdhi
variant. So, we need a variant specific start_signal_voltage_switch().
As I see it, the above patch reduces one layer of abstraction. This is
nice, but the variant specific callback is still there. or?
Or i still got you wrong, then sorry!
Thanks,
Wolfram
